Dynamic NMR Study of the Hindered Pt−N(bipyridine) Rotation in Metal-Directed Self-Assembled Macrocycles

The activation parameters for the hindered Pt−N(bipyridyl) rotation observed for a self-assembled rectangle and triangle have been investigated by temperature-dependent and selective inversion recovery (SIR) NMR spectroscopy. The enthalpy of activation (ΔH ⧧) and change in entropy (ΔS ⧧) were determ...

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Bibliographic Details
Published in:Organic letters 2005-10, Vol.7 (22), p.4971-4973
Main Authors: Tárkányi, Gábor, Jude, Hershel, Pálinkás, Gábor, Stang, Peter J
Format: Article
Language:English
Subjects:
Macrocyclic Compounds - chemical synthesis
Macrocyclic Compounds - chemistry
Magnetic Resonance Spectroscopy
Platinum - chemistry
Pyrimidines - chemistry
Temperature
Thermodynamics
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Summary:The activation parameters for the hindered Pt−N(bipyridyl) rotation observed for a self-assembled rectangle and triangle have been investigated by temperature-dependent and selective inversion recovery (SIR) NMR spectroscopy. The enthalpy of activation (ΔH ⧧) and change in entropy (ΔS ⧧) were determined to be +52.2 kJ/mol and −58.2 J/mol·K for the rectangle and +59.1 kJ/mol and −71.8 J/mol·K for the triangle, respectively, by SIR.
ISSN:1523-7060
1523-7052
DOI:10.1021/ol051910u